Concrete wall mold



March 9 192s.

A. BARSTAD CONCRETE WALL MOLD Filed 001,. 6, 1925 2 Sheets-Sheet 1 March 9 1926.

1,575,959 A. BARSTAD A CONCRETE WALL MOLDv Filed Oot- 6, 1925 2 Sheets-Sheet 2 sb I l *i* m gj l w l @lt/CHIM.

Patented Mar. 9, 1926.

ADOLF BARSTAD, OF SMILEY TOWNSHIP, PENNINGTON COUNTY, MINNESOTA.

CONCRETE WALL MOLD.

Application med october e, 19251 semi No. 60,364.

. To all 'whom t may concern:

Be it known that I, ADoLF BARSTAD, a citizen of t-he United States, residing at the township of Smiley, in the county of Pennington and State of Minnesota, have invented certain new and useful Improvements in a Concrete Wall Mold, of which the following is a specification.

rlhis invention relates to improvements in molds and more particularly for a mold vused in forming a concrete wall.

@ne of the important objects of the present invention is to provide a mold which may be readily set up in position for use, the same including inner and outer forms whereby the concrete wall which is to be formed is provided with an air duct between the walls,

A further object is to provide a. mold of the above mentioned character which inchicles a simple and efficient means for joining the spaced walls together at certain intervals whereby the air ducts will be formed Y between the inner and outer portions of the walls.

A still further object is to provide a mold of the above mentioned character which includes an adjustable outer section whereby the sections of the wall and the portions thereof between the air duct in the outer faces to be regulated.

A further object is to provide a mold of the above mentioned' character which is simple in construction, inexpensive, and furthermore adapted to the purposes for which the same is designated.

Other objects and advantages of this invention will become apparent during the course of the following description.

In the accompanying drawing forming part of this specification and in which like numerals are employed Vto designa-te like parts throughout the same:

Figure 1 is a top plan view of the mold embodying lmy invention showing the same in its assembled position.

Fig. 2 is a sectional view taken approximately on line 22 of Fig. 1.

Fig. 3 is a side elevation of one of the outer forms or sections and the supporting members associated therewith.

Fig. 4; is a fragmentary side elevation'of the inner forms or sections showing the position of the inverted U-shaped member which provides the connection between the inner and outer portions of the wall.

Fig. 5 is a detail perspective view of the aforementioned U-shaped member, and

\ Fig. 6 is a detail perspective view of the looking plate.

In the drawings wherein for the purpose of illustration is shown the preferred embodiment of my invention, the numeral 1 designates the outside form, the same being substantially of rectangular design. Cooperating with the outside forms are the inside forms 2, the same being also substantially Each of the forms rectangular in design. comprises la single piece of lwood or metal and arranged on the outer face of each of the outer forms are the strips 3.

The supporting means for the outer forms comprises a pair of standards 4: and 5 respectively, the same being of a suitable length. A pair of transversely extending spaced cross bars 6 and 7 respectively, are secured on opposite sides of the standards 4 and 5 adjacent the upper ends thereof by the fastening means illustrated at 8, The purpose of the spaced cross vbars will be presently apparent. A bolt 9 is threaded transversely through the lower end of each of the standards and engages the lower strip 3 on the outside of each of the outer forms 1 for the purpose of moving the same inwardly towards each other. Vertically extending bolts 10 are threaded into the upper edges of the upper strip arranged on the outer face of each of the outer forms land these bolts extend upwardly between the spaced cross bars 6 and throughv the blocks 11 which are adapted for slidable movement across ythe upper edges of the spaced cross bars so as to permit the upper portions of the outerA forms to be moved inwardly towards eaclr other and held in the desired adjusted position so that various thicknesses of the wall' which is to be formed may be regulated; The upper ends of the spaced standards are held in'proper spaced relationy with'respect to each other through the medium of the transversely extending members 12. The inner forms or sections 2 are provided in their inner opposed faces adjacentthe upper edges thereof with the arcuate grooves 13 for receiving the curved endsy the respective lower edges of the inner forms by the toggle joints designated generally by the numeral 18.

As is clearly illustrated in Figs. 2 and et of the drawings, the inner sections or forms are of such height Vas to necessitate the placing of the sections comprising the inner forms in superposed relation so that the lower edge of the upper sections will rest on the upperedge of the lower sections and said sections will be disposed in the same vertical plane. The upper section is of greater llength than the lower section and the lower sections are spaced from each other for accommodating the substantially inverted U- shaped member 19, the purpose of which is to provide a means whereby a connection between the inner and outer sides ofthe wall may be had when a wall is tov be formed by the mold with the saine being provided with an air duct. i

`The use of these moldsmay be briefly stated as follows. After the foundation for the wall has been formed, the parts comprising my improved mold are assembled in the manner as shown in Fig. 2 and the concrete or other material from which the wall to be formedris placed between the inner and outer forms of the mold and the usual tainping process is employed. 1n constructing a straight wall, enough of the forms are provided to accommodate the length of the wall. It isof course to be understood that the form may also be used in constructing` walls for silos, towers or other buildings and the shape of the forms will `necessarily cor respond with the structure which is to be formed. By rotating'the threaded rods 16 in one direction, the locking plates 15 are brought into engagement with the arcuate grooves 13 provided for the curved ends ofV the plate in the interposed faces of the inner forms and furthermore the toggle joints 18 are spread apart for holding the lower por tions `of the inner forms in proper spaced Vielation with respect to each other.

The bolts 9 and 1() will secure the outer forms in proper spaced relation with respect to the adjacent inner forms so that the desii'ed thickness of the inner and outer portions of the wall which is to be constructed may be obtained.

For the purpose of preventing the collapsing of the inner forms,there is provided the coiled springs 20, the same being disposed between the inner opposed faces of the inner forms adjacent the upper edges thereof.

After the concrete has been set, the forms are removed as is also the inverted U-shaped member'l) and the parts are again assembled so as to build up the wall and at spaced iiitervals. The inverted U-shaped member 19 is used for forming a connection between the inner and outer portions 21 and 22 respec terial from escaping and when the concrete Y has firmly set, the parts may be readily and easily removed.

The inverted U-shapedmeinber 19 is in"A serted between the adjacent end of the sections of the inner foi-nis, the open bottom of the aforementioned `member being temporarily closed when the concrete is pouredl and until the samehardens. This U-shaped member is inserted in such a` manner as to have its open sides disposed adjacent the re-` spective concrete walls which are `to bev formed. i

Vllien the concrete `is poured intothe mold between the inner and outer forms, the saine will flow inte the inside of the U-shaped member through the open sides thereof where the U-shaped member will beI filled, thus forming a union or connection between the inner and outer walls. rllhe poured concrete will be prevented from escapingl through the open bottom of theU--shaped member by reason of a closure provided therefor. Any suitable means may be employed for closing the open bottom of the inverted tlshaped member such as the use of a piece of wire mesh screen ora metallic plate which is placed across the tcp of the portions of the concrete walls alread formed` and on which the mold is placed, the lower free edges of the arms of the inverted tJ-shaped member resting on said screen or plate. it will `of course be understood that the wire mesh screen or plate whichever is used will remain embedded in` the concrete after the latter hashardened,aiid` the forms and the Ushaped member have been removed. j j

The provision of a mold of the above men tioned character will enable a concrete wall with an air space therein to be formed in a manner which is simple and efiicient and at a very low cost, the parts' comprisinga mold being readily assembled or disassembled and* furthermore adjustable. j Y

While I have shown the preferred embodiment of my invention, it iste be understood that various changes in the size, shape and arrangement of parts may be resorted to without' departing from the spirit of sacri-` ficing an of `the advantagesV of the aiin v i; pended claims. v

Havin g thus described my invention, what I claim as new is l. A mold for forming a concrete wall with an air duct comprising outer andinner forms, means for securing the outer forms7 means for locking the inner forms in their assembled position, and means associated with the inner forms for forming a connection between the portions of the walls formed by the aforementioned forms.

2. A moldfor forming a concrete wall with an air duct comprising outer and inner forms, means for securing the outer forms,

means for locking the inner forms in their assembled position comprising a vertically disposed threaded rod, a toggle joint connecting the lower end of the rod with the respective lower ends of the inner forms, and a locking plate carried by the upper portion of the rod and adapted to be brought into locked engagement with the inner opposed faces of the inner forms adjacent the upper edges thereof.

3. A mold for forming a concrete wall with an air duct comp-rising outer and inner forms, means for securing and supporting the outer forms, means for locking the in ner forms in their assembled positions, additional means for adjusting the outer forms with respect to the inner forms, the inner forms including spaced sections, and a substantially inverted U-shaped member adapted to be disposed between the spaced ends of the sections whereby a joint between the inner and outer portions of the concrete wall to be formed is provided.

4. A mold for forming a concrete wal] with an air duct, comprising inner and outer forms, supporting means for the outer forms, comprising spaced vertical standards, a pair of spaced cross bars extending transversely between the upper portions of the standard and secured thereto, bolts threaded transversely through the lower ends of the standards and engaging the adjacent portions of the outer forms, bolts extending Vertically between the cross bars and threaded into the upper portions of the outer forms, blocks slidable on the cross bars and through which the last mentioned bolts extend, said bolts providing a means for adjusting the outer forms with respect to the inner forms, and means for locking the inner forms in their assembled position.

5. A mold for forming a concrete wall with an air duct, comprising inner and outer forms, supporting means for the outer forms, comprising spaced vertical standards, a pair of spaced cross bars extending transversely between the upper portions of the standard and secured thereto, bolts threaded transversely through the lower ends of the standards and engaging the adjacent por tions of the outer forms, bolts extending vertically between the cross bars and threaded into the upper portions of the outer forms, blocks slidable on the cross bars, and through which the last mentioned bolts extend, said bolts providing a means for adjusting the outer forms with respect to the inner forms, means for locking the inner forms in their assembled position, said means comprising a vertically disposed threaded rod, a' toggle joint connecting the lower end thereof with the lower ends of the respective inner forms, the inner opposed faces of the upper portions ofthe inner forms being provided with arcuate grooves, and a locking plate carried by the upper portion of the threaded rod, the ends being curved and adapted for cooperation with the arcuate grooves when the plates are disposed in a predetermined position.

In testimony whereof I aiiiX my signature.

ADOLF BARSTAD. 

